Pneumatic tool



W. H. KELLER.

PNEUMATIC TOOL. APPLICATION man JULY 8,1918.

Patented June 20, 1922;

lwue'nkw wzzzmm 12511211;

WILLIAM H. KELLERQOF enann navnn, MICHIGAN.

PNEUMATIC TOOL.

Application filed July 8, 1918. Serial No. 243,754.

To all whom it may concern:

Be it known that 1, WILLIAM H. IIELL'ER, a citizen of the United States,residing in the city of Grand Haven, in the county of Ottawa and Stateof Michigan, have invented certain new and useful Improvements inPneumatic Tools, whereof the following is a specification, referencebeing had to the accompanying drawings.

My invention relates to that class of pneumatic tools in which theactuating medium is introduced'through the handle of the tool itself,and the features of improvement relate more particularly to the meanswhereby the casing, or body, of the tool is secured to the handleportion, and also to the construction and arrangement of the exhaustports, whose ultimate outlet is situated in the region adjacent to thehandle.

In the accompanying drawings, Fig. I, represents an axial orlongitudinal section through a pneumatic hammer embodying my invention.

Figs. II, and'III, represent transverse sec tions thereof on therespective planes inclicated by the lines, IIII, and III-III.

' As the general construct-ion of tools of this character, is wellunderstood, I will omit any detailed description of the ordinaryfeatures; beyond the statement that the handle is provided with an inletduct 2, for the supply of actuating medium, said duct beingvalve-controlled in the usual way. The forward end portion of the handleis provided with an elongated annular exten sion 3, in effect a hollowcylinder,-whose internal surface is threaded so as to receive and engagewith the correspondingly threaded rear portion 6 of the casing 7 saidrear portion of the casing 7 being preferably provided with anunthreaded extension 5, at its rear extremity. The piston 9, is shown inan intermediate position within the casing and the shank 8, of a tool isindicated at the front end of the casing.

Referring now to the means of securing the casing within its cylindricalseat 3, upon the handle, the features of improvement will be noted moreparticularly by reference to Fig. III.

In the unthreaded rear extremity 5, of the casing are formed a.plurality of radial slots 15, arranged at symmetrical intervalsthroughout the periphery, and in this in stance sixteen in number. Theslots are open at their rear ends, the elongated sides beingparalleland, merging into semi-circles of similar diameter at the frontends. In that portion of the casing-seat which immediately surrounds theextremity 5, of the casing, I form circular radial holes13,,corresponding in diameter to the slots 15, but arranged at differentcircumferential intervals, in this instance three of suchwholes beingprovided. f

I provide a. pin 16, of suflicient length to extend through the holes13,-in the casingseat and into the slots 15, in the extremity of thecasing, said pin fitting snugly in said holes and slots, so that when itis inserted in position there can be substantially no rotative play ofone part in relation to the other.

A spring clip 12, is mounted upon the ex ternal surface of thecasing-seat, so as to embrace about three-quarters of the circumferencethereof; said clip being provided with an inwardly projecting flange 14,along one edge, which'fiange engages in an annular groove 18, formedaround the external surface of; the casing-seat,and thus preventsaccidental displacement of the spring clip, whilst permitting rotativeadjustment there of. This spring clip is adapted to hold the pin 16,against accidental displacement and the pin'may, conveniently beattached to the interior surfaceof the spring clip 15, pref-e erably atits longitudinal center, as shown.

In order to secure the casing in any given position, it is screwed intothe seat until the slots 15, are brought into the general range of theholes 13'. V

By reason of the relatively large number of slots-15, and the lack ofcorrespondence in their respective circumferential intervals withrelation to the intervals between the holes 13, some one of the slots15, willreadily be found to register with'one of the holes 13, when thecasing is screwed home. The pin 16, can be inserted at the point of suchregistration, and will be held there, by

means of the spring clip, against accidental displacement. 7

Referring now to the features connected with the exhaust, it is notnecessary to describe the details of the valve 20, and valve chamber 21,beyond stating that the exhaust port 23 communicates by means ofincline-d passages 24:, shown in dotted lines in Fig. I, with apluralityof ports, 22, which extend radially and preferably in quadrant relationthrough the rear end portion 6, of the casing.

An annular channel or exhaust passage groove 25, is formed in thecasing-seat 3, into which channel said ports 22, lead. The inner Wall orboundary of this passage groove 25 is formed, it will be seen, by thethreaded exterior of the casing 7.

Outlet ports 26, in this instance 5 in number, are formed. through thewall of the casing-seat 3, being comprised within an arc of thecircumference thereof, which lies well on the under side of the tool asit is ordinarily held in position by means of the handle 1, so that theultimate discharge of the exhaust is dispersed through a plurality ofopenings, and is directed away from the hand, or person, of theoperator, under normal conditions of use.

Having thus described my invention, I claim:

1. In a pneumatic tool, the combination of a handle provided with aforwardly projecting extended annular casing-seat, having an internalthread, said seat being pro vided, at the region adjacent to the handlewith a plurality of radial holes; a casing having its rear extremityexternally threaded in correspondence with the thread upon thecasing-seat, and having, at its inner extremity, a relatively largeplurality of slots corresponding substantially in transverse diameterwith the holes of the casing-seat,.

but arranged at angular intervals which differ from those of the latter;a pin adapted to be inserted endwise and extend through any one of saidholes and into the slots of the casing; and means embracing said casingseat for retaining said pin in inserted position in any one of saidholes.

2. In a pneumatic tool, the combination of a handle provided with aforwardly projecting extended annular casing-seat, having an internalthread, said seat being provided, at the region adjacent to the handlewith a plurality of radial holes; a casing having its rear extremityexternally threaded in correspondence with the thread upon thecasing-seat, and having, at its inner extremity, a relatively largeplurality of slots corresponding substantially in transverse diameterwith the holes of the casing-seat, but arranged at angular intervalswhich differ from those of the latter; a pin adapted to be insertedendwise and extend through any one of said holes and into the slots ofthe casing; and a spring clip fitting upon the external surface of thecasing-seat, adapted to retain said pin in operative position in. anyone of said holes and so engaged with said casing-seat as to be keptfrom movement thereon in an axial direction.

3. In a pneumatic tool, the combination of a handle provided with aforwardly projecting extended annular casing-seat, having an internalthread, said seat being provided, at the region adjacent to the handlewith a plurality of radial holes; a casing having its rear extremityexternally threaded in correspondence with the thread upon thecasingseat, and having, at its inner extremity, a relatively largeplurality of slots corresponding substantially in transverse diameterwith the holes of the casing seat, but arranged at angular intervalswhich differ from those of the latter; a spring clip rotatively mountedupon the external surface of the casing-seat at the region surroundingthe holes therein, and provided with means for preventing movement in anaxial direction upon said seat; and a pin rigidly attached to the saidclip, said pin being adapted to be inserted endwise and to extendthrough any one of said holes and into the slots of the casing. V

In testimony whereof, I have hereunto signed my name at Grand Haven,Mich, this 2nd day. of July, 1918.

WILLIAM H. KELLER. W itnesses':

L, HERRMANSN, v ELWoon SAMrsoN.

